Depaetment of the jostteeioe



( No Model.)

P. W. FRAIN.

{ SMOKE CONSUMING FURNAGB.

y N0. 285,887. Patented Oct. 2, 1883n 1719.1.

As ,f l Y r n (ZM @y WHW@ UNITED STATES PATENT EEICE.

PATRICK W. FBAIN, OF ST. LOUIS, MISSOURI. l

sMoKE-coNsuMlNc FURNAcE.

SPEGIFICATION forming part of Letters PatentNo. 285,887, dated October 2, 1883. Application filed March 13, 1883. (No modell) To all whom t may concern: Be it known that I, PATRICK St. Louis, Missouri, havemade a new and useful Improvement in Smoke-Consuming Furnaces, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, making part of this specification, in which- Figure l is a vertical longitudinal section taken through a furnace having the improvemeut; Fig. 2, a horizontal section on the line 2 2 of Fig. l; Fig. 3, a vertical cross-section on the line 3 3 of Fig. l, and Fig. 4 a vertical cross-section on the line 4 4 of Fig. 4.

The same letters of reference denote the same parts.

The improvement is shown in the drawings in connection with an ordinary steam-boiler, A, Vthe shape of which is well understood.

B represents the furnace beneath the boiler. An air pipe or flue, C, leads from the ash-pit D upward, near the bridge-wall E, into the furnace-chamber B; thence through the furnace-chamber to or toward the'front b of the chamber; thence returning to and past the bridge-wall E into the flue F, thence past a diaphragm, G, and nally terminating in the portion f of the flue F. f

To better distribute the air escaping from the pipe O into-the iiue F, the pipe is provided with branches c c, causing the air to be delivered to the right and to the left in the Hue. The object of the pipe C is to deliver heated air into the flue F. To this -end the pipe is arranged in the middle of the furnace-chamber, and, preferably, sufficiently above the grate-bars H to bring the pipe into the hottest part ofthe fire. The air then becomes highly heated by the time it reaches the flue F, at which point it encounters the smoke coming from the furnace-chamber. The iiue F is,

in effect, a second combustioir chamber, wherel in the smoke, with the aid of the heated air -introduced through the pipe C, is consumed.

The flue F is the full width of the furnace chamber, preferably, and extends from the boiler downward to about the level of the grate-bars H. It does not, however, extend to the rear end of the boiler, but is contracted to form the flue I, which, as shown more dis W. FRAIN, of

tinctly in Fig. 4, is quite shallow and made to conform to the curvature of the boiler.

The improvement is operative without the diaphragm G, but better results are obtained when the diaphragm is used. The smoke from the furnace, as indicated by the arrows, descends after passing the bridge-wall, and then, after passingl the diaphragm, rises and eX- pands in the iiuespace f, and at that point mingles with the hot air. The result is further improved by introducing auxiliary hetair `currents through the pipes J J, which lead, at each side of the furnace-chamber, from the front of the furnace through the furnace-chambei' and diaphragm, and terminating in the space f. The movement of the air through the pipes J J is indicated by the arrows in Figs. l, 2, and the movement of the air-current through the pipe O is indicated by the arrows in Fig. l more especially. The diaphragm G is preferably perforated at g g, Fig. 3, to allow a small portion of the smoke to pass through the diaphragm, which, in practice, being made of iire-brick, becomes highly heated, and the smoke, in consequence, pass ing through the diaphragmis more readily consumed.

I claim" l. The `combination of the chamber B, the

space F, the diaphragm G, and the pipe O,

having the branches c c, arranged substantially as shown and described.

2. The combination of the furnace-cha`mber B, the flue F, the pipe O, the pipes J J, and

the diaphragm G, substantially as described.

3. The combination of the furnace-chamber B, the ash-pit D, the pipe O, the iiue F, the diaphragm G, and the flue I, substantially as described.

4. The furnacechamber B, having the airpipe C, leading from the ash-pit D upward into the furnace-chamber, thence th rough said chamber, and thence past the bridge-wallv and leading into the flue F, behind the diaphragm G, substantially as shown and described.

Witness myhand this 9th day of March, 1883.

PATRICK W. FRAIN. Witnesses: y

C. D. MOODY, GnARLEs PIeKLEs.

DEPARTMENT OF THE INTERIOR,

UNITED STATES PATENT GFFICE,

Wasmngon, D. 0'., November 2, 1883.

Whereas, Charles D. M oody, attorneyv for the party in interest, has, in Writing', refused to receive Letters Patent No. 285,887, grunted October :5, 1883, upon the application of Patrick W. Frein, of St. Louis, Missouri, for an improvement in Smoke-Consuming Furnaces, for the reason that claim l of the printed specifica-tion Wes improperly included es a part thereof and that one of the claims of the application was omitted therefrom, and-f- Whereas, ain examination of the cese shows that said Letters Patent Were not issued in accordance with the official .record of the case;

It is hereby ordered that the seal of seid Letters Patent be broken and the grant returned to the le marked Canceled, and that Letters Patent in proper form he issued pursuant to the record of' the ense in the .Patent (mice.

[SEAL] BENJ. .BUTTERWonTH,

` Commissioner of' Patents. Approved H. M. TELLER,

Secretary of the Inferior. 

